Upgrade README.md

Signed-off-by: Simone Arpe <[email protected]>

Author: simoarpe

README.md

@@ -247,8 +247,8 @@ editableAnnotationTypes: ['Ink', 'Highlight']
 - Android SDK
 - Android Build Tools 23.0.1 (React Native)
 - Android Build Tools 26.0.1 (PSPDFKit module)
-- PSPDFKit >= 4.4.1
-- react-native >= 0.54.2
+- PSPDFKit >= 4.6.0
+- react-native >= 0.55.4
 
 #### Getting Started